Vulnerability details

CVE-2026-119568

vsftpd vsftpd

vsftpd through 3.0.5 require_ssl_reuse Bypass via FTPS Data Channel Hijacking

CVSS 4.0

9.1Critical

Official description

vsftpd through 3.0.5 contains an authentication bypass vulnerability in ssl_data_accept() that allows unauthenticated attackers to hijack FTPS data connections by resuming their own TLS session ticket. Attackers sharing the victim's source IP can obtain a ticket via AUTH TLS, then connect to the victim's PASV port to steal downloads or inject upload data.

CVSS scores

Score	Version	Source	Vector
9.1Critical	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`
7.4High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
vsftpd	vsftpd	v ≤ 3.0.5	CVEProject cvelistV5 (CNA)

References and advisories

https://abraxaslabs.tech/research/vsftpd-ssl-data-any-ticket third-party-advisory
https://security.appspot.com/vsftpd.html product
https://www.vulncheck.com/advisories/vsftpd-through-3.0.5-require-ssl-reuse-bypass-via-ftps-data-channel-hijacking third-party-advisory

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Details

Published: 2026-10-30
Last updated: 2026-10-30
State: Published
Assigner (CNA): VulnCheck
Kolun priority: 22 · Low

Exploit prediction (EPSS)

0.4%

Probability of exploitation in 30 days

34.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-940
Improper Verification of Source of a Communication Channel